s390/pfault: use __set_task_state

Use __set_task_state() instead of set_task_state(). Saves a couple of
instructions, since the memory barrier is not needed here.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1 file changed